Tape with interlocking device

ABSTRACT

A zipper-member-having tape  1  according to the present invention includes a pair of male tape  11  and female tape  12 , the male tape  11  and the female tape  12  having zipper members  10  engageable with each other. The male tape and the like  11, 12  include a seal layer  111, 121  and a non-seal layer  112, 122 , the non-seal layer  112, 122  being a portion excluding the seal layer  111, 121  and the zipper members  10 . A first convex thread  115, 125  is provided on a surface of the seal layer  111, 121  of the male tape  11  and the female tape  12  while a second convex thread  116, 126  is provided on a surface of the non-seal layer  112, 122  of the male tape  11  and/or the female tape  12.

TECHNICAL FIELD

The present invention relates to a zipper-member-having tape forunsealing and resealing a bag, the tape being provided at an opening ofthe bag.

BACKGROUND OF THE INVENTION

As a packaging material for packaging various articles such as foods,pharmaceutical and medical products and groceries, there has beentypically used a packaging bag that is openable and resealable by azipper-member-having tape provided at an opening of the bag. The zippermember of the tape, which is belt-like shaped, includes a pair of a malemember and a female member that are engaged with each other. As atypical method for manufacturing such a packaging bag as allows theopening of the bag to be opened and resealed, there is typically andwidely used a method including making the zipper-member-having tape inadvance and heat-sealing the zipper-member-having tape to a sealantlayer of a base film forming a bag body.

In heat-sealing the zipper-member-having tape to the sealant layer ofthe base film, the zipper-member-having tape is generally double-layeredin order to improve a heat-sealing speed. In this case, a melting pointof a resin material forming a non-seal layer (on which the zipper memberis provided) is generally set to be higher than that of a resin materialforming a seal layer (a layer heat-sealed to the sealant layer of thebase film). The zipper-member-having tape is manufactured bycoextrusion. Although the tape is formed as a laminate body of differentresins, an interlaminar intensity of a certain degree is obtainablewithout using any adhesives, and the degree of the intensity poses nopractical disadvantage.

When the zipper-member-having tape is used as the tape, there is asufficient interlaminar intensity applied between the seal layer and thenon-seal layer that form the tape with the zipper member. However, whenthe zipper-member-having tape is heat-sealed with the base film, heat ofheat-sealing by a seal-bar is applied to the tape via the base film, anda force for adhering non-compatible resins, which is applied on aninterface between the seal layer and non-seal layer, is lost due to theheat of the heat-sealing. Accordingly, there has been a risk that thezipper-member-having tape may be detached from between the seal layerand the non-seal layer.

Further, there has been another problem that the non-seal layer of themale tape may be welded with that of the female tape due to the heatapplied by the seal-bar in the above-described manner when heat-sealed,and there has been a demand for improvements.

In order to prevent the zipper-member-having tape and a bag-forming filmfrom being distorted and to firmly heat-seal the both layers, it hasbeen suggested to provide a plurality of ribs on the seal layer in adouble-layered zipper-member-having tape (for example, see PatentDocument 1).

[Patent Document 1] JP-A-2000-287718 (Claim 1, FIG. 4)

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

However, although the zipper-member-having tape disclosed in PatentDocument 1 can prevent the tape and the bag-forming film from beingdistorted when heat-sealed, the zipper member-having tape can neithersufficiently prevent an interlaminar separation between the seal layerand the non-seal layer nor prevent the welding of the non-seal layers.Thus, the zipper-member-having tape is not practically applicable.

An object of the present invention is to firmly heat-seal azipper-member-having tape that has a multi-layer of a seal layer and anon-seal layer with a sealant layer of a bag-forming base film, and toprovide a zipper-member-having tape that can prevent an interlaminarseparation of a multi-layered zipper-member-having tape formed fromdifferent resins (e.g., an interlaminar separation between the seallayer and the non-seal layer) and that can prevent the non-seal layersfrom being welded with each other.

Means for Solving the Problems

In order to achieve the object described above, a zipper-member-havingtape according to a first aspect of the present invention is azipper-member-having tape including: a pair of a male tape and a femaletape, the male tape and the female tape having zipper members engageablewith each other, in which the male tape and the female tape include aseal layer and a non-seal layer, the non-seal layer being a portionexcluding the seal layer and the zipper members, a resin materialforming the seal layer is substantially non-compatible with a resinmaterial forming the non-seal layer, a plurality of convex threads areprovided on a surface of the seal layer of the male tape and the femaletape, and a plurality of convex threads are provided on a surface of thenon-seal layer of the male tape and/or the female tape.

The zipper-member-having tape according to the aspect of the presentinvention is formed by the male tape and the female tape. The male tapeand the female tape include the seal layer and the non-seal layer thatis the portion excluding the seal layer and the zipper member, in whichthe non-seal layer is provided on a side on which the zipper member isprovided. The plurality of convex threads (first convex thread) areformed on the surface of the seal layer of the male tape and the femaletape while the plurality of convex threads (second convex thread) areformed on the surface of the non-seal layer of the male tape and/or thefemale tape.

Since the first convex thread formed on the surface of the seal layer isfused to be heat-sealed to the base film when a heated seal-bar appliesheat to the tape via the base film in a heat-sealing operation, asealing strength of the tape and the base film is maintained at a highlevel, and the heat and pressure applied to a concave portion betweenthe convex threads (i.e., a portion excluding the first convex threadsof the seal layer) are relaxed, such that a deformation and flexure ofthe zipper member and an interlaminar separation between the seal layerand the non-seal layer can be prevented to a certain degree.

The second convex thread formed on the non-seal layer surface laminatedto the seal layer provides a desired space between the male tape and thefemale tape on the zipper member side even in the heat-sealingoperation. Thus a contact area between the non-seal layer of the maletape and the female tape can be made smaller, such that the heat appliedin the heat-sealing operation can be radiated (heat-radiating effect)and the heat and pressure applied to one of the zipper-member-havingtape (i.e., one of the male tape and the female tape) can be preventedfrom transmitted to the other (the other of the male tape and the femaletape) (heat-insulating effect), thereby preventing the male tape frombeing welded to the female tape in the heat-sealing operation.

In addition to the heat-radiating and heat-insulating effects by thesecond convex thread on the non-seal layer, the concave portion betweenthe first convex threads on the seal layer relaxes the heat andpressure, such that the male tape and the female tape are prevented frombeing excessively heated, whereby the interlaminar separation betweenthe seal layer and the non-seal layer during the heat-sealing operationcan be prevented.

A zipper-member-having tape according to a second aspect of the presentinvention is a zipper-member-having tape including: a pair of a maletape and a female tape, the male tape and the female tape having zippermembers engageable with each other, in which the male tape and thefemale tape include: a seal layer; and a non-seal layer formed ofmultiple layers, the non-seal layer being a portion excluding the seallayer and the zipper members, a resin material forming the seal layer issubstantially non-compatible with a resin material forming the non-seallayer laminated to the seal layer, or at least a pair of resin materialsadjacently laminated in the non-seal layer are substantiallynon-compatible with each other, a plurality of convex threads areprovided on a surface of the seal layer of the male tape and the femaletape, and a plurality of convex threads are provided on a surface of thenon-seal layer of the male tape and/or the female tape.

The zipper-member-having tape according to the second aspect is providedby modifying the zipper-member-having tape according to the first aspectsuch that the non-seal layer is multi-layered. When the non-seal layeris multi-layered as described above, it is necessary to take intoconsideration not only the interlaminar separation between the seallayer and the non-seal layer when a resin material forming the seallayer is substantially non-compatible with that of the non-seal layer tobe laminated to the seal layer but also an interlaminar separationwithin the non-seal layer when at least a pair of resin materialsadjacently laminated in the non-seal layer are substantiallynon-compatible with each other.

As in the tape according to the first aspect, by forming the firstconvex thread on the surface of the seal layer, the deformation andflexure of the zipper member, the interlaminar separation between theseal layer and non-seal layer, or the interlaminar separation within themulti-layered non-seal layer can be prevented to a certain degree whilethe sealing strength of the tape and the base film is maintained at ahigh level.

In addition, the second convex thread formed on the non-seal layersurface laminated to the seal layer can radiate the heat applied in theheat-sealing operation (heat-radiating effect), and prevent the heat andpressure applied to one of the zipper-member-having tape from beingtransmitted to the other (heat-insulating effect), thereby preventingthe male tape from being welded to the female tape in the heat-sealingoperation.

In addition to the heat-radiating and heat-insulating effects by thesecond convex thread on the non-seal layer, the concave portion betweenthe first convex threads on the seal layer relaxes the heat andpressure, such that the male tape and the female tape are prevented frombeing excessively heated, whereby the interlaminar separation betweenthe seal layer and the non-seal layer or the interlaminar separationwithin the multiple-layered non-seal layer can be appropriatelyprevented.

Since the zipper-member-having tape according to the present inventioncan be heat-sealed to the sealant layer of the base film forming the bagand prevent the interlaminar separation between the seal layer and thenon-seal layer during the heat-sealing operation (or the interlaminarseparation within the multi-layered non-seal layer) and the welding ofthe non-seal layer, the zipper-member-having tape can exert theadvantages to the maximum extent not only when being applied to ageneral flat bag such as a bag sealed along three edges but also whenbeing applied to a bag product such as a side-gusset bag in which thetape cannot be conveyed in an MD direction of the base film and needs tobe inserted in a TD direction of the base film without using aseparator.

In the zipper-member-having tape according to the aspect of the presentinvention, it is preferable that the convex thread provided on thesurface of the seal layer is substantially quadrangular incross-section.

According to the aspect, since the convex thread (first convex thread)provided on the surface of the seal layer is substantially quadrangularin cross-section, a contact area between the first convex thread and thesealant layer of the base film, to which the tape is welded, can beappropriately enlarged and the sealing strength can be reinforced.

In the zipper-member-having tape according to the aspect of the presentinvention, it is preferable that a mounting width of the convex threadprovided on the surface of the seal layer is 0.5 mm or more and a heightof the convex thread is 0.08 mm or more, and a summation of a mountingarea of the convex thread is 20 to 80% of a surface area of the seallayer.

Since the convex thread (first convex thread) formed on the surface ofthe seal layer has the mounting width of 0.5 mm or more and the heightof 0.08 mm or more, the first convex thread can be fused to be welded tothe sealant layer of the base film on a larger area when heat-sealed,whereby the sealing strength of the tape and the base film can bereliably enhanced.

In addition, since the summation of the mounting area of the firstconvex thread is 20 to 80% of the surface area of the seal layer, thezipper-member-having tape can contact the base film on an appropriatelylarger area when heat-sealed. Accordingly, the sealing strength of thetape and the base film to which the tape is sealed is enhanced and theproportion of the concave portion between the first convex threadsbecomes a desired value, thereby reliably preventing the interlaminarseparation between the seal layer and the non-seal layer in theheat-sealing operation (or the interlaminar separation within themulti-layered non-seal layer).

In the zipper-member-having tape according to the aspect of the presentinvention, it is preferable that the convex thread provided on thesurface of the non-seal layer is substantially triangular shaped incross-section.

According to the aspect of the present invention, since the convexthread formed on the non-seal layer (second convex thread) is triangularin cross-section, the second convex thread can contact the non-seallayer facing the second convex thread on a smaller area, therebyefficiently preventing the welding of the second convex thread and thenon-seal layer facing the second convex thread in the heat-sealingoperation.

In the zipper-member-having tape according to the aspect of the presentinvention, it is preferable that a height of the convex thread providedon the surface of the non-seal layer is 0.03 mm or more.

According to the aspect of the present invention, since the height ofthe convex thread formed on the surface of the non-seal layer (secondconvex thread) is 0.03 mm or more, the heat and pressure applied to oneof the zipper-member-having tapes (one of the male tape and female tape)is reliably prevented from being transmitted to the other tape (theother of the male tape and female tape), thereby efficiently preventingthe interlaminar separation between the seal layer and the non-seallayer of the zipper-member-having tape in the heat-sealing operation (orthe interlaminar separation within the multi-layered non-seal layer) andthe welding of the non-seal layer provided on the pair of thezipper-member-having tape.

In addition, when a combination of the resin materials that aresubstantially non-compatible with each other is a combination of resinmaterials Whose sealing strength becomes 25 N/15 mm wide or less whenboth the resin materials are laminated in form of a film and heat-sealedto each other, the zipper-member-having tape according to the presentinvention is free from a problem such as the interlaminar separationdescribed above, whereby a practically applicable zipper-member-havingtape is provided. By appropriately selecting the resin materials thatare on the above-described relationship with each other for the seallayer and non-seal layer, the seal layer and non-seal layer each may bearranged to have a different property and function. Accordingly, a widevariety of tape product designs becomes possible by selectingappropriate materials.

Note that the “heat-sealing” operation in the present invention isperformed, for example, under the following conditions (i) to (iv) (inthe description below, one of the resin materials is referred to as the“seal layer” while the other resin material is referred to as the“non-seal layer” for a convenience. When the non-seal layer is multilayered, the “seal layer” and the “non-seal layer” are respectivelyequivalent to the mutually non-compatible resin materials forming thenon-seal layers.).

(i) Obtaining by a general method (a) a film using a resin materialforming the seal layer (thickness: approximately 0.06 to 0.12 mm), (b) afilm formed of the resin material forming the seal layer (thickness:approximately 0.01 to 0.04 mm), (c) a film formed of a resin materialforming the non-seal layer (thickness: approximately 0.15 to 0.18 mm)and (d) a film using the resin material forming the non-seal layer(thickness: 0.04 to 0.10 mm), and laminating the films in this order.(ii) Pressing the seal-bar to the laminated layers from (a) side, andsealing (a) to (b) by heat-sealing under the following conditions.

Sealing temperature: the melting point of the resin material forming theseal layer +10° C.

Sealing pressure: 0.2 Mpa

(iii) Pressing the seal-bar to the laminated layers from (c) side, andsealing (c) to (d) by heat-sealing under the following conditions.

Sealing temperature: 200° C. Sealing temperature: the melting point ofthe resin material forming the non-seal layer +10° C.

Sealing pressure: 0.2 Mpa

(iv) Measuring the sealing strength of (b) and (c) having beensimultaneously sealed in accordance with the above described (ii) and(iii) (i.e., the sealing strength of the film formed of the resinmaterial forming the seal layer and the film formed of the resinmaterial forming the non-seal layer), and using the resin materialswhose sealing strength becomes 25 N/15 mm wide or less. Incidentally,the measurement of the sealing strength may be performed using acommercially available autograph tensile testing machine under ameasuring condition of 300 mm/min at 180° peeling.

When the combination of the resin materials that are substantiallynon-compatible with each other is a combination selected from a groupconsisting of a combination of linear low-density polyethylene usingmetallocene catalyst (metallocene LLDPE) and polypropylene (PP); acombination of ethylene-vinyl-acetate copolymer (EVA) and polypropylene(PP); and a combination of ethylene-vinyl-acetate copolymer (EVA) andhigh-density polyethylene (HDPE), the above-described advantages can bereliably obtained.

As one embodiment of the zipper-member-having tape according to thefirst and second aspects of the present invention, the plurality ofconvex threads provided on the surface of the non-seal layer of the maletape and/or the female tape are provided on a first side demarcated bythe zipper member when the first side is seen from a width cross-sectionof the male tape and/or the female tape, and the non-seal layer of themale tape and the non-seal layer of the female tape on a second sideforms a pseudo-adhesion structure, the second side being demarcated bythe zipper member when the second side is seen from the widthcross-section of the male tape and the female tape. The“pseudo-adhesion” is not particularly limited as long as the adhesiveforce thereof is so weak as to allow the pseudo-adhesion to be easilyreleased by hands, and the adhesive force of the pseudo-adhesion isgenerally 5 to 20 N/15 mm.

With this arrangement, it is possible to prevent a mal-adhesion of thenon-seal layers when the tape is heat-sealed to the film in a bagmanufacturing operation. In addition, since the other side of thenon-seal layer surface of the zipper-member-having tape, which faces adownstream side of a bag manufacturing line, forms the pseudo-adhesionstructure during the heat-sealing operation, it is possible to prevent abag product from being defected by a peeling of the zipper-member-havingtape in the bag manufacturing operation, whereby the bag manufacturingefficiency is improved. A bag manufacturing operation in which thezipper-member-having tape is inserted from a direction perpendicular toa flow direction of the bag manufacturing line can be performed with adramatically-improved efficiency as compared with an operation using aconventional zipper-member-having tape.

When the zipper-member-having tape is applied to a bag, it is preferablethat the first side of the zipper-member-having tape adheres to a sideadjacent to an opening of the bag while the second side of thezipper-member-having tape adheres to a side opposite to the sideadjacent to the opening of the bag (i.e., a side adjacent to anon-opening of the bag, a side adjacent to a content). Since convexthread ribs are provided on the non-seal layer surface of thezipper-member-having tape facing the opening side of the bag, the bag iseasily opened by hands. Although the non-seal layer of thezipper-member-having tape forms the pseudo-adhesion structure on thenon-opening side of the bag (i.e., a content side), the adhesive forcethereof is so weak as to allow the bag to be easily opened by hands andthus does not impair an openability of the bag.

BRIEF DESCRIPTION OF THE DRAWING(S)

FIG. 1 is a cross-sectional view showing a zipper-member-having tapeaccording to an embodiment of the present invention;

FIG. 2 is a fragmentary enlarged view of FIG. 1;

FIG. 3 is a front view showing a male tape seen from a seal layerdirection;

FIG. 4 is a front view showing a male tape seen from a non-seal layerdirection; and

FIG. 5 is a cross-sectional view showing the zipper-member-having tapeheat-sealed to a base film according to the present invention.

EXPLANATION OF CODES

-   1: zipper-member-having tape-   10: zipper member-   11: male tape-   12: female tape-   111, 121: seal layer-   112, 122: non-seal layer-   113: head-   114: connector-   123: first hook-   124: second hook-   115, 125: first convex thread-   116, 126: second convex thread-   40: base film-   401: sealant layer-   402: outer layer

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below withreference to the attached drawings.

FIG. 1 is a cross-sectional view showing a zipper-member-having tapeaccording to the present embodiment.

Codes in FIG. 1 respectively represent a zipper-member-having tape (1),a zipper member (10), a male tape (11), a female tape (12), a seal layer(111, 121), a non-seal layer (112, 122), a head (13), a connector (114),a first hook (123) and a second hook (124).

FIG. 1 is a cross-sectional view showing the zipper-member-having tape 1in engagement, which is formed by the head 113 of the male tape 11, thefirst hook 123 and the second hook 124 of the female tape 12.

The zipper-member-having tape 1, whose cross-section is shown in FIG. 1,includes a pair of a male tape 11 and a female tape 12 formed ofthermoplastic resins.

The male tape 11 includes: the seal layer 111 welded to an opening of abag body (not shown); the non-seal layer 112 laminated to the seal layer111 and provided on a side where the zipper member 10 is arranged; thehead 113 substantially arrow-tip shaped in cross section; and theconnector 114 for connecting the non-seal layer 112 and the head 113,all of which are integrally formed.

Similarly to the above-described male tape 11, the female tape 12includes: a seal layer 121 welded to the opening of the bag body (notshown); the non-seal layer laminated to the seal layer 121; and thefirst hook 123 and the second hook 124 connected with the non-seal layer122 and circular-arc shaped in cross section, the first hook 123 and thesecond hook 124 facing each other.

In the zipper-member-having tape 1, the head 113 and the connector 114of the male tape 11 and the first hook 123 and the second hook 124 ofthe female tape 12 form the zipper member 10, and the bag is opened andresealed by engaging and disengaging these members.

In the present embodiment, the non-seal layer 112, the head 113 and theconnector 114 of the male tape 11 are integrally formed from onematerial while the non-seal layer 122, the first hook 123 and the secondhook 124 of the female tape 12 are integrally formed from anothermaterial.

Resin materials forming the seal layers 111, 121 and the non-seal layers112, 122 are respectively selected from thermoplastic resins such thatthe resin materials are non-compatible with each other. The resinmaterials may be selected such that a melting point of the resinmaterial forming the non-seal layers 112, 122 are higher than that ofthe resin material forming the seal layers 111, 121. When the meltingpoint of the resin material forming the non-seal layers 112, 122 are nothigher than that of the resin material forming the seal layers 111, 121,surfaces on the zipper member 10 side of the male tape 11 and the femaletape 12 (surfaces of the non-seal layers 112, 122) may be welded witheach other when heat-sealed, which is detrimental to heat-sealing andproduct yield.

On the other hand, when the difference between the melting points of theresin materials are large, a heat-sealing speed can be easily increased.Thus, it is preferable that the melting point of the resin materialforming the non-seal layer 112, 122 is higher than that of the resinmaterial forming the seal layer 111, 121 by 20° C. or more.

In this Description, “substantially non-compatible” not only means thatthe resin material forming the seal layer 111, 121 is non-compatiblewith the resin material forming the non-seal layer 112, 122 at all, butalso means that the resin material forming the seal layer 111, 121 isslightly compatible with the resin material forming the non-seal layer112, 122. The resin materials may be slightly compatible with eachother, where, for example, the resin materials are a combination ofresin materials whose sealing strength becomes 25 N/15 mm wide or lesswhen both the resin materials are laminated in form of a film and healsealed to each other under predetermined conditions (the above describedconditions (i) to (iv)).

Combinations of such resin materials forming the seal layer 111, 121 andthe non-seal layer 112, 122 (seal layer 111, 211/non-seal layer 112,122) are exemplified as follows: a combination of linear low-densitypolyethylene using metallocene catalyst (metallocene LLDPE) andpolypropylene (PP); a combination of ethylene-vinyl-acetate copolymer(EVA) and polypropylene (PP); and a combination ofethylene-vinyl-acetate copolymer (EVA) and high-density polyethylene(HDPE).

Incidentally, a melt flow rate (MFR) of the resin material forming thenon-seal layer 112, 122 of the zipper-member-having tape 1 is preferably3 to 10 g/10 minutes, more preferably 5 to 9 g/10 minutes. When the MFRof the resin material is less than 3 g/10 minutes, it may be difficultto extrude the head 113 (and the connector 114) as a component of thezipper member 10 of the male tape 11 and the first hook 123 and thesecond hook 124 as a component of the zipper member 10 of the femaletape 12, both of which are integrally formed with the non-seal layers112, 122. On the other hand, when the MFR of the resin material is morethan 10 g/10 minutes, tip ends of the first hook 123 and the second hook124 of the female tape 12 may be easily closed and the connector 114 ofthe male tape 11 may be easily tumbled, which makes it difficult toextrude the zipper member 10 into a predetermined reopenable andresealable shape.

According to the present invention, as shown in FIG. 1, a plurality ofconvex threads (first convex threads 115, 125) are provided along alongitudinal direction of the tape 1 on a surface of the seal layer 111,121 (a surface that is heat-sealed to a sealant layer 401 of the basefilm 40 shown in FIG. 5, as will be described below). With thisarrangement, the first convex thread 115, 125, which is provided on thesurface of the seal layer 111, 121, is fused to be heat-sealed to thebase film when the heated seal-bar applies heat to the tape 1 via thebase film during the heat-sealing operation.

The seal-bar applies the heat and pressure to the first convex thread115, 125 when heat-sealing the tape 1 to the sealant layer of the basefilm, and the heat and the pressure applied to a concave portion betweenthe first convex threads 115, 125 on the seal layer 111, 121 are relaxeduntil the first convex thread 115, 125 is welded and leveled.Accordingly, while the sealing strength of the tape and the base filmcan be maintained to be high, an interlaminar separation between theseal layer 111, 121 and the non-seal layer 112, 122 and a deformationand flexure of the zipper member can be prevented.

The concave portion between the first convex threads 115, 125 relaxesthe heat and pressure, such that the male tape 11 and the female tape 12are prevented from being excessively heated and pressurized. The concaveportion between the first convex threads 115, 125, as well asheat-radiating and heat-insulating effects of a below-described secondconvex thread 116, 126 provided on the non-seal layer 112, 122, canprevent the interlaminar separation between the seal layer 111, 121 andthe non-seal layer 112, 122 in the heat-sealing operation.

In FIG. 1, the first convex thread 115, 125 is isosceles-trapezoidshaped in cross-section. The cross-sectional shape of the first convexthread 115, 125 provided on the surface of the seal layer 111, 121 maynot be trapezoidal but may be substantially quadrangular such asrectangular and quadrate, whereby a contact area of the first convexthread 115, 125 with the sealant layer of the base film (see FIG. 5), towhich the tape is welded, can be appropriately enlarged and the sealingstrength can be reinforced.

The first convex thread 115, 125 may have any other cross-sectionalshape and may be exemplarily formed to be substantially triangular andpolygonal (e.g. pentagonal and semicircular).

On the other hand, a plurality of convex threads (the second convexthread 116, 126) are provided along the longitudinal direction of thetape 1 on a surface of the non-seal layer 112, 122 that is laminated tothe seal layer 111, 121 (a surface on which the zipper member 10 isprovided). The second convex thread 116, 126 provided on the surface ofthe non-seal layer 112, 122, provides an appropriate space between themale tape 11 and the zipper-member 10 side of the female tape 12 so asto prevent the non-seal layer 112 of the male tape 11 from contactingthe non-seal layer 122 of the female tape 12 in the heat-sealingoperation. In addition, the second convex thread 116, 126 can radiatethe heat applied in the heat-sealing operation, thereby preventing themale tape 11 from being welded to the female tape 12 in the heat-sealingoperation.

In FIG. 1, the second convex thread 116, 126 is triangular incross-section. By making the second convex thread 116, 126 triangular,the contact area of the second convex thread 116, 126 with the non-seallayer 112, 122 facing the second convex thread 116, 126 can be madesmall, thereby efficiently preventing the welding of the non-seal layers112, 122 facing each other in the heat-sealing operation.

The second convex thread 116, 126 may have any other cross-sectionalshape and may be exemplarily substantially quadrangular (e.g.trapezoidal, rectangular and quadrate), polygonal (e.g. pentagonal) andsemicircular in cross-section.

FIG. 2 is a fragmentary enlarged view of FIG. 1 (the male tape 11), FIG.3 is a front view showing the male tape 1 seen from a seal-layer-111direction, and FIG. 4 is a front view showing the male tape seen from anon-seal-layer-112 direction. Although FIGS. 2 to 4 exemplarily showsthe male tape 11, the female tape 12 is similarly arranged in thepresent embodiment.

A height h₁ of the first convex thread 115 formed on the seal layer 111is preferably 0.08 mm or more (FIG. 2), and more preferably 0.1 to 0.3mm or more. With the height h₁ being 0.08 mm or more, the first convexthread 115 formed on the seal layer 111 can contact the sealant layer ofthe base film to which the tape is heat-sealed (see FIG. 5) on a largerarea, whereby the sealing strength of the tape and the base film can bereliably enhanced.

A mounting width d of the first convex thread 115 (a surface contactingthe seal layer surface on which the first convex thread 115 is mounted;hereinafter the same shall apply) is preferably 0.5 mm or more, and morepreferably 0.7 to 2 mm. With the mounting width d being 0.5 mm or more,the first convex thread 115 can contact the sealant layer of the basefilm to which the tape is heat-sealed on a larger area, whereby thesealing strength of the tape and the base film can be enhanced.

According to the present invention, a proportion of the first convexthread 115 to the surface of the seal layer 111 may influence thesealing strength of the tape and the base film to which the tape isheat-sealed and on an effect to prevent the interlaminar separationbetween the seal layer 111 and the non-seal layer 112, the effect beingentailed by heat-insulating performed by the concave portion between thefirst convex threads 115.

The proportion of the first convex portion 115 to the surface of theseal layer 111 is preferably such that a summation of the mounting areaof the first convex threads 115 is 20 to 80% of the surface area of theseal layer 111, and more preferably such that the summation is 40 to 60%the surface area of the seal layer 111. With the summation of themounting area of the first convex threads 115 being 20 to 80% of thesurface area of the seal layer 111, the sealing strength of the tape andthe base film to which the tape is heat-sealed is enhanced, and theinterlaminar separation between the seal layer 111 and the non-seallayer 112 in the heat-sealing operation can be reliably prevented.

In contrast, when the proportion of the first convex thread 115 is lessthan 20%, a less portion of the first convex thread 115 is fused in theheat-sealing operation to be heat welded to the sealant layer of thebase film, which may pose a risk that an enhancement of the sealingstrength of the tape and the base film may be impaired. On the otherhand, when the proportion of the first convex thread 115 exceeds 80%,the arrangement of the tape becomes substantially the same as anarrangement in which no first convex thread 115 is formed on the seallayer 111 and the tape thickness is increased. Thus, the heat and thepressure applied by the seal-bar to the tape is hardly relaxed, whichmay cause the interlaminar separation between the seal layer 111 and thenon-seal layer 112.

In the present embodiment, the surface area of the seal layer 111 isobtained by multiplying a tape width shown in FIG. 3 by a length of thetape 1. The mounting area of the first convex thread 115 is obtained bymultiplying the mounting width d of the first convex thread 115 shown inFIGS. 1 and 3 by the length of the tape 1.

A height h₂ of the second convex thread 116 formed on the non-seal layer112 is preferably 0.03 mm or more, and more preferably 0.05 mm or more.An upper limit of the height h₂ of the second convex thread ispreferably 0.3 mm. With the height h₂ of the second convex thread 116 ofthe non-seal layer 112 being 0.03 mm or more, the heat and the pressureapplied to one of the male tape 11 or the female tape 12 can be reliablyprevented from being transmitted to the other. With this arrangement, itis possible to efficiently prevent the seal layer 111, 121 and thenon-seal layer 121, 122 of the zipper-member-having tape 1 from beinginterlaminarly separated during the heat-sealing operation, and the pairof non-seal layers 112, 122 of the zipper-member-having tape 1 frombeing welded with each other.

A thickness t₁ of the seal layer 111 (the portion excluding the firstconvex thread 115) is not particularly limited but may be 0.01 to 0.04mm, and a thickness t₂ of the non-seal layer 112 (the portion excludingthe second convex thread 116) is not particularly limited but may be 0.1to 0.2 mm.

As shown in FIGS. 1 and 3, the thickness sum t₁+t₂ of the seal layer111, 121 and the non-seal layer 112, 122, the height h₁, h₂ respectivelyof the first convex thread 115, 125 formed on the seal layer 111, 121and the second convex thread 116, 126 formed on the non-seal layer 112,122, and a thickness T of the a portion of the zipper-member-having tape1 at which the zipper member 10 is provided are preferably on arelationship represented by a formula (I) as shown below. When therelationship is not satisfied, either of the convex threads is so highas to cause a practical problem that the position of the zipper member10 may not be easily conceived when the zipper-member-having tape is tobe engaged by hands (incidentally, although FIG. 1 shows h₁, h₂ andt₁+t₂ with respect to the male tape 11, the same is true with respect tothe female tape 12).

[Formula 1]

0.5TV≧2h ₁+2(t ₁ +t ₂)+h ₂  (I)

Although FIG. 1 shows the first convex thread 115, 125 and the secondconvex thread 116, 126 according to the present invention in anexaggerated manner, the maximum thickness of the actual tape 1 can beusually found at the portion at which the zipper member 10 is provided.

The male tape 11 as a component of the zipper-member-having tape 1 has across-section as shown in FIG. 1. The male tape 11 is obtained byintegrating the seal layer 111 on which the first convex thread isformed, the non-seal layer 112 on which the second convex thread isformed, and the head 112 and the connector 114 continuously formed fromthe non-seal layer 112 by a known coextrusion method. Likewise, thefemale tape 12 is obtained by integrating the seal layer 121 on whichthe first convex thread is formed, the non-seal layer 122 on which thesecond convex thread is formed and the first hook 123, and the secondhook 124 continuously formed from the non-seal layer 122 by a knowncoextrusion method. When the zipper-member-having tape 1 is formed bysuch a coextrusion-forming method, the tape 1 can be manufactured in asimplified process at low cost. In addition the zipper-member-havingtape 1 can be stably manufactured in a continuous manner.

The seal layer 111, 121 of the zipper-member-having tape 1 is welded tothe base film 40 that forms a bag body (not shown), the base film 40being transformed into a bag to obtain a package bag with thezipper-member-having tape 1.

FIG. 5 is a cross-sectional view showing the zipper-member-having tape 1heat-sealed to the base film 40 according to the present invention. Whenthe zipper-member-having tape 1 is heat-sealed to the base film 40, thefirst convex thread 115, 125 formed on the surface of the seal layer111, 121 is fused to be welded to the sealant layer 401 of the base film40.

Welding conditions (temperature, pressure, etc.) can be determined asdesired in accordance with types of the resins used for thezipper-member-having tape 1 and the base film 40 for forming the bagbody.

The arrangement of the bag body having an opening to which thezipper-member-having tape 1 according to the present invention isheat-sealed is not particularly limited but may include a known bagshape such as a bag sealed along four edges, a side-gusset bag and abottom-gusset bag.

Particularly, the zipper-member-having tape 1 is preferably usable evenwhen the zipper-member-having tape cannot be conveyed in a MD directionof the base film but needs to be inserted in a TD direction of the basefilm without using a separator in a bag product such as the side-gussetbag.

Although FIG. 5 shows a laminate film in which the sealant layer 401 islaminated over an outer layer 402 as the base film 40 for forming thebag body, a laminate film in which a middle layer (not shown) such as agas barrier layer, a light-shielding layer and a strength-reinforcinglayer is provided between the outer layer 402 and the sealant layer 401may be used depending on a required performance. Incidentally, the outerlayer 402, the middle layer (not shown) and the sealant layer 401 may berespectively formed of a single layer, or at least one of these layersmay be formed of a plurality of layers.

The plurality of convex threads (first convex threads 115, 125), whichare formed on the seal layers 111, 121 in the zipper-member-having tape1 as described above, are fused to be heat-sealed to the base film 40when applied with the heat by the heated seal-bar via the base film 40in the heat-sealing operation. While the sealing strength of the tape 1and the base film 40 is maintained at a high level, the concave portionbetween the first convex threads 111, 125 relaxes the heat and pressure,such that a deformation and flexure of the zipper member 10 issuppressed, thereby desirably preventing the interlaminar separationbetween the seal layer 111, 121 and the non-seal layer 112, 222.Further, the second convex threads 116, 126, which are provided on thesurface of the non-seal layer 112, 122, provide an appropriate spacebetween the male tape 11 and the zipper-member 10 side of the femaletape 12 so as to prevent the non-seal layer 112 of the male tape 11 fromcontacting the non-seal layer 122 of the female tape 12 in theheat-sealing operation. In addition, the second convex thread 116, 126can radiate the heat transmitted in the heat-sealing operation(heat-radiating effect) and can prevent the heat and pressure applied toone of the male tape 11 or the female tape 12 from being transmitted tothe other (heat-insulating effect), thereby preferably preventing themale tape 11 from being welded to the female tape 12 in the heat-sealingoperation.

The heat-radiating and heat-insulating effects of the second convexthreads 116, 126 on the non-seal layer 112, 122, synergistically withthe heat-radiating effect of the concave portion between the firstconvex threads 115, 125 on the seal layer 111, 121, prevent the maletape 11 and the female tape 12 from being excessively heated, therebypreventing the interlaminar separation between the seal layer 111, 121and the non-seal layer 112, 122 in the heat-sealing operation.

The zipper-member-having tape 1 according to the present invention, asarranged in the above-described manner, is applicable to wide variety ofproducts where the tape 1 is attached to an opening of a package bag forpackaging various articles such as foods, pharmaceutical and medicalproducts and groceries.

MODIFICATION OF EMBODIMENTS

It should be noted that the above-described embodiment merely shows anembodiment of the present invention, and the present invention is notlimited to the above-described embodiment, where modifications andimprovements are included within the scope of the present invention aslong as an object and an advantage of the present invention can beachieved. In addition, specific arrangements and profiles whenimplementing the present invention may be altered as long as an objectand an advantage of the present invention can be achieved.

For example, in above-described FIG. 1, ribs 116, 126 that are providedon a side of the non-seal layer surface at which the “T” representingthe thickness of the zipper-member-having tape 1 is shown (“the otherside” described in Claim 9) may be omitted (omission of total fourteenribs), and a pseudo-adhesion layer may be provided to the other sideend(s) of the male tape 11 and/or the female tape 12 of thezipper-member-having tape 1 so that the two layers are pseudo-adheredwith each other.

For example, when the non-seal layer of the male tape is ofpolypropylene, a layer of low-density polyethylene and a composition ofpolypropylene and polyethylene (polyethylene-rich) may be provided tothe non-seal layer surface of the female tape.

On the other hand, when the non-seal layer of the male tape is ofhigh-density polyethylene, a layer of polypropylene and a composition ofpolypropylene and polyethylene (polypropylene-rich) may be provided tothe non-seal layer surface of the female tape.

Such a zipper-member-having tape 1 is attached to the bag such that theside at which the “T” representing the thickness of thezipper-member-having tape 1 (“the other side” described in Claim 9)faces a non-opening side of the bag (a content side). Since the convexthread ribs 116, 126 are provided on the non-seal layer surface of thezipper-member-having tape 1 facing the opening side of the bag, the bagis easily opened by hands. Although the non-seal layers of thezipper-member-having tape 1 are pseudo-adhered with each other on thenon-opening side (i.e., the content side) of the bag, the adhesive forceis so weak as to allow the bag to be easily opened by hands thus doesnot impair an openability of the bag.

Although the non-seal layer 112, 122 of the male tape 11 and the femaletape 12 is a single layer, with which the zipper member 10 is integrallyformed in the above-described embodiment, the non-seal layer 112, 122may be formed of multiple layers, in which the zipper member 10 isprovided on the innermost layer of the multiple layers of the non-seallayer 112, 122.

Although the second convex thread 116, 126 is formed on the non-seallayer of 112, 122 of the male tape 11 and the female tape 12 in theabove-described embodiment, the second convex thread 116, 126 may beprovided on either of the male tape 11 or the female tape 12.

Although six of the first convex threads 115, 125 are provided on eachof the content side (upper side in FIG. 1. the same is truehereinafter.) and the opening side (lower side in FIG. 1. the same istrue hereinafter) of the seal layer 111, 121 (total twelve threads)while seven of the second convex thread 116, 126 are provided on each ofthe content side and the opening side of the non-seal layer 121, 122(total fourteen threads) in the above embodiment, the present inventionis not limited thereto, but the number of the first convex thread 115,125 and the second convex thread 116, 126 may be determined as desired.

In the zipper-member-having tape 1 in the above-described embodiment,the components of the zipper member 10, i.e., the head 113 having asubstantially arrow-tipped shape of the male tape 11 and the first andsecond hooks 123, 124 each having a substantially arc shape of thefemale member 12, are engaged with and disengaged from each other tounseal and reseal the bag. However, the shape of the zipper member 10 isnot limited to the one as in the above-described embodiment but may beany shape as long as the zipper member 10 can perform unsealing andresealing. The shape and the number of the heads 113 and the first andsecond hooks 123, 124 may be arbitrarily determined.

Although the seal layer 111, 121, the first convex thread 115, 125formed on the seal layer 111, 121, the non-seal layer 112, 122 and thesecond convex thread 116, 126 formed on the non-seal layer 112, 122 arepreferably integrally formed of the same resin material, the seal layer111, 121 and the non-seal layer 112, 122 may be formed of a resinmaterial different from that of the first convex thread 115, 125 and thesecond convex thread 116, 126 respectively as long as an object and aneffect of the present invention is not impaired.

Although the non-seal layer 112, 122 is laminated over the seal layer111, 121 to be integrated with the zipper member 10 in FIG. 1, thezipper member 10 (including the connecter 114 of the male tape 11) andthe seal layer 111, 121, for example, may be separately formed to beintegrally adhered with each other using an adhesive and the like. Inaddition, a middle layer (not shown) with which the zipper member isintegrally formed may be provided between the seal layer 111, 121 andthe non-seal layer 112, 122 to be laminated to the non-seal layer 112,122.

Although the non-seal layer 112, 122 is single-layered and the resinmaterial forming the seal layer 111, 121 is substantially non-compatiblewith that of the non-seal layer 112, 122 in the above-describedembodiment, the non-seal layer may be multiple-layered. In this case,not only when the resin material forming the seal layer is substantiallynon-compatible with that of the non-seal layer 112, 122 laminated to theseal layer but also when at least a pair of layers adjacently laminatedin the non-seal layer are substantially non-compatible with each other,effects of the present invention can be obtained.

Specifically, with the first convex thread being formed on the surfaceof the seal layer (the resin material forming the seal layer) as in theabove-described embodiment, the sealing strength of the tape and thebase film is maintained at a high level and the heat and the pressureapplied to the concave portion between the convex threads (portion ofthe seal layer other than the convex thread) is relaxed. Accordingly, itis possible to desirably prevent the deformation and flexure of thezipper member, the interlaminar separation between the seal layer andthe non-seal layer, and an interlaminar separation inside themultiple-layered non-seal layer. With the second convex thread beingformed on the non-seal layer surface laminated to the seal layer, thecontact area between the non-seal layers of the male tape and the femaletape can be reduced, such that the heat applied in the heat-sealingoperation can be radiated (heat-radiating effect) and the heat and thepressure applied to one of the male tape and the female tape can beprevented from being transmitted to the other (heat-insulating effect),thereby preventing the male tape from being welded to the female tape inthe heat-sealing operation.

Also as in the above-described embodiment, the heat-radiating andheat-insulating effects by the second convex thread on the non-seallayer, as well as the relaxation of the heat and pressure by the concaveportion between the first convex threads on the seal layer, can preventthe male tape and the female tape from being excessively heated, wherebythe interlaminar separation between the seal layer and the non-seallayer or the interlaminar separation in the multiple-layered non-seallayer can be prevented as desired.

The specific arrangement, the profile and the like described in theembodiment of the present invention can be altered as long as an objectof the present invention can be attained.

Example

Now, the present invention will more specifically be described below byproviding examples and comparisons, the content of which by no meanslimits the scope of the present invention.

In the examples and the like described below, resin properties weremeasured with the melt flow rate (MFR) being based on JIS K7210 (21.1 Nload at 230° C.) and a melting point being based on JIS K7121.

Example 1

With respect to the zipper-member-having tape as shown in FIG. 1,materials forming the seal layer and the non-seal layer (including thezipper member) were coextruded using a commercially availableextrusion-molding machine in a manner described below, such that twelveconvex threads of an isosceles-trapezoid shape with a height of 0.1 mm(first convex thread) were provided on the seal layers (thickness: 0.02mm) of the male tape and the female tape respectively and fourteenequilateral-triangular convex threads with a height of 0.06 mm and amounting width per thread of 0.15 mm were provided on the non-seallayers (thickness: 0.16 μm) of the male tape and the female taperespectively. By this method, the zipper-member-having tape according tothe present invention was obtained.

The summation of the mounting width of the first convex threads was 5 mmand the mounting area of the first convex threads was 30% of the surfacearea of the seal layer. In addition, the thickness T of thezipper-member-having tape 1 at the portion where the zipper member wasprovided shown in FIG. 1 was 1.5 mm.

(Material: Seal Layer)

Linear low-density polyethylene using metallocene catalyst was used(7P12A: Manufactured by Tosoh Corporation, MFR: 12 g/10 minute, MeltingPoint: 93° C., Density: 900 kg/cm³).

(Material: Non-Seal Layer)

Random polypropylene was used (F-744NP: Manufactured by Idemitsu KosanCo., Ltd., MFR: 7 g/10 minute, Melting Point: 133° C., Density: 900kg/cm³).

Example 2

In the zipper-member-having tape obtained by the method described in theexample 1, the shape of the first convex thread formed on the seal layerwas modified to a triangle with a height of 0.1 mm from theisosceles-trapezoid shape with the height of 0.1 mm. Except for themodification, a zipper-member-having tape was obtained by the samemethod as in the example 1.

[Comparison 1]

In the zipper-member-having tape obtained by the method described in theexample 1, the shape of the first convex thread formed on the seal layerwas modified to a triangle with a height of 0.1 mm from theisosceles-trapezoid shape with the height of 0.1 mm, and no secondconvex thread was formed on the non-seal layer. Except for thesemodifications, a zipper-member-having tape was obtained by the samemethod as in the example 1.

[Comparison 2]

In the zipper-member-having tape obtained by the method shown in theexample 1, no first convex thread was formed on the seal layer. Exceptfor the modification, a zipper-member-having tape was obtained by thesame method as in the example 1.

[Comparison 3]

In the zipper-member-having tape obtained by the method described in theexample 1, the shape of the first convex thread formed on the seal layerwas modified to a triangle with a height of 0.06 mm from theisosceles-trapezoid shape with the height of 0.1 mm, and no secondconvex thread was formed on the non-seal layer. Except for thesemodifications, a zipper-member-having tape was obtained by the samemethod as in the example 1.

[Comparison 4]

In the zipper-member-having tape obtained by the method shown in theexample 1, no convex thread was formed on either of the seal layer andthe non-seal layer. Except for the modification, a zipper-member-havingtape was obtained by the same method as in the example 1.

[Examination 1]

The zipper-member-having tapes obtained in Examples 1, 2 and ComparativeExamples 1 to 4 were heat-sealed three times to a linear low-densitypolyethylene side of the base film arranged as below (by touching theseal-bar to the tape two times from the male tape side and one time fromthe female tape side) under the following sealing conditions of sealingpressure of 2 kg/cm²; sealing temperature of 150° C.; and sealing timeof 1 second, set by a commercially available heat-sealing tester,whereby a gusset bag was obtained.

After being heat-sealed in this manner, the sealing strength of thezipper-member-having tape and the base film, the welding of the non-seallayers of the zipper-member-having tape and the interlaminar separationbetween the seal layer and non-seal layer were checked, compared andevaluated. The results are shown in Table 1 together with thearrangements of Examples 1, 2 and Comparative Examples 1 to 4.

Measurement of the sealing strength was performed in the followingmanner.

(Arrangement of Base Film)

Multi-layered film (total thickness: 85 μm) of Nylon film (Ny)(thickness: 15 μm) and linear low density polyethylene (LLDPE)(thickness: 70 μm) was used as the base film.

(Evaluation of Sealing Strength)

The base film and the zipper-member-having tape heat-sealed to eachother were cut into a piece with 15 mm wide to obtain a test sample, andthe test sample was measured with an autograph tensile testing machineunder a measuring condition of 300 mm/min at 180° peeling. In addition,the evaluation was conducted in accordance with the following evaluationcriteria.

(Evaluation Criteria)

Evaluation Contents Excellent: Sealing Strength of 30 N/15 mm wide ormore. Good: Sealing Strength of 25 N/15 mm wide or more, less than 30N/15 mm wide. Not Good: Sealing Strength of less than 25 N/15 mm wide.

TABLE 1 (Result) [Example 1] [Example 2] [Comparison 1] [Comparison 2][Comparison 3] [Comparison 4] Convex Shape Isosceles- Triangle Trianglenone Triangle none Threads of Trapezoid Seal Layer Height (mm) 0.1 0.10.1 0.06 (First Summation of 5 5 5 5 Convex Mounting Thread) width (mm)Proportion of 30 30 30 30 Summation of Mounting Area (%) Convex ShapeTriangle Triangle None Triangle None None Threads of Height (mm) 0.060.06 0.06 Non-Seal Mounting 0.15 0.15 0.15 Layer Width (mm) (Second (PerThread) Convex Thread) Evaluation Sealing Excellent: Good: Good: NotGood: Good: Not Good: Result Strength Welding Not Observed Not ObservedObserved Not Observed Observed Observed Interlaminar Not Observed NotObserved Observed Observed Observed Observed Separation

As is understood from the results shown in Table 1, thezipper-member-having tape according to the present invention obtained inExamples 1 and 2 was sealed to the base film with a high sealingstrength, where neither welding of the non-seal layers during theheat-sealing operation nor interlaminar separation between the seallayer and non-seal layer was caused in the zipper-member-having tape.

As compared with Example 2 in which the shape of the first convex threadwas equilateral-triangular in cross-section, the tape was sealed to thebase film with a higher sealing strength in Example 1 in which the shapeof the first convex thread was isosceles-trapezoid in cross-section.

On the other hand, in Comparative Examples 1 and 3 in which the tape inExample 1 was modified such that the shape of the first convex threadwas triangular in cross-section while no second convex thread wasprovided on the non-seal layer, the tape was sealed to the base filmwith a less seal strength as compared with Example 1, and the welding ofthe non-seal layers during the heat-sealing operation and theinterlaminar separation between the seal layer and non-seal layer wereobserved.

In Comparative Example 2 in which the tape in Example 1 was modifiedsuch that no first convex thread was provided on the seal layer, thetape was sealed to the base film with a much less seal strength ascompared with Example 1, and although the welding of the non-seal layersduring the heat-sealing operation was not confirmed, the interlaminarseparation between the seal layer and non-seal layer was observed.

In Comparative Example 4 in which the tape in Example 1 was modifiedsuch that no convex thread was provided on either the seal layer or thenon-seal layer, the tape was sealed to the base film with a much lessseal strength as compared with Example 1, and the welding of thenon-seal layers during the heat-sealing operation and the interlaminarseparation between the seal layer and non-seal layer were observed.

INDUSTRIAL APPLICABILITY

The present invention is applicable to a wide variety ofzipper-member-having tapes that are heat-sealed to an opening of thepackage bag that packages various articles such as foods, pharmaceuticaland medical products and groceries in an openable and resealable manner.

1. A zipper-member-having tape, comprising: a pair of a male tape and afemale tape, the male tape and the female tape having zipper membersengageable with each other, wherein the male tape and the female tapeinclude a seal layer and a non-seal layer, the non-seal layer being aportion excluding the seal layer and the zipper members, a resinmaterial forming the seal layer is substantially non-compatible with aresin material forming the non-seal layer, a plurality of convex threadsare provided on a surface of the seal layer of the male tape and thefemale tape, and a plurality of convex threads are provided on a surfaceof the non-seal layer of the male tape and/or the female tape.
 2. Azipper-member-having tape, comprising: a pair of a male tape and afemale tape, the male tape and the female tape having zipper membersengageable with each other, wherein the male tape and the female tapeinclude: a seal layer; and a non-seal layer formed of multiple layers,the non-seal layer being a portion excluding the seal layer and thezipper members, a resin material forming the seal layer is substantiallynon-compatible with a resin material forming the non-seal layerlaminated to the seal layer, or at least a pair of resin materialsadjacently laminated in the non-seal layer are substantiallynon-compatible with each other, a plurality of convex threads areprovided on a surface of the seal layer of the male tape and the femaletape, and a plurality of convex threads are provided on a surface of thenon-seal layer of the male tape and/or the female tape.
 3. Thezipper-member-having tape according to claim 1, wherein the convexthread provided on the surface of the seal layer is substantiallyquadrangular in cross-section.
 4. The zipper-member-having tapeaccording to claim 1, wherein a mounting width of the convex threadprovided on the surface of the seal layer is 0.5 mm or more and a heightof the convex thread is 0.08 mm or more, and a summation of a mountingarea of the convex thread is 20 to 80% of a surface area of the seallayer.
 5. The zipper-member-having tape according to claim 1, whereinthe convex thread provided on the surface of the non-seal layer issubstantially triangular shaped in cross-section.
 6. Thezipper-member-having tape according to claim 1, wherein a height of theconvex thread provided on the surface of the non-seal layer is 0.03 mmor more.
 7. The zipper-member-having tape according to claim 1, whereina combination of the resin materials that are substantiallynon-compatible with each other is a combination of resin materials whosesealing strength becomes 25 N/15 mm wide or less when both the resinmaterials are laminated in form of a film and heat-sealed to each other.8. The zipper-member-having tape according to claim 7, wherein thecombination of the resin materials that are substantially non-compatiblewith each other is a combination selected from a group consisting of acombination of linear low-density polyethylene using metallocenecatalyst (metallocene LLDPE) and polypropylene (PP); a combination ofethylene-vinyl-acetate copolymer (EVA) and polypropylene (PP); and acombination of ethylene-vinyl-acetate copolymer (EVA) and high-densitypolyethylene (HDPE).
 9. The zipper-member-having tape according to claim1, wherein the plurality of convex threads provided on the surface ofthe non-seal layer of the male tape and/or the female tape are providedon a first side demarcated by the zipper member when the first side isseen from a width cross-section of the male tape and/or the female tape,and the non-seal layer of the male tape and the non-seal layer of thefemale tape on a second side forms a pseudo-adhesion structure, thesecond side being demarcated by the zipper member when the second sideis seen from the width cross-section of the male tape and the femaletape.
 10. A zipper-member-having bag, comprising a zipper-member-havingtape including a pair of a male tape and a female tape, the male tapeand the female tape having zipper members engageable with each other,wherein the male tape and the female tape include a seal layer and anon-seal layer, the non-seal layer being a portion excluding the seallayer and the zipper members, a resin material forming the seal layer issubstantially non-compatible with a resin material forming the non-seallayer, a plurality of convex threads are provided on a surface of theseal layer of the male tape and the female tape, a plurality of convexthreads are provided on a surface of the non-seal layer of the male tapeand/or the female tape, the plurality of convex threads provided on thesurface of the non-seal layer of the male tape and/or the female tapeare provided on a first side demarcated by the zipper member when thefirst side is seen from a width cross-section of the male tape and/orthe female tape, the non-seal layer of the male tape and the non-seallayer of the female tape on a second side forms a pseudo-adhesionstructure, the second side being demarcated by the zipper member whenthe second side is seen from the width cross-section of the male tapeand the female tape, and the first side of the zipper-member-having tapeadheres to a side adjacent to an opening of the bag while the secondside of the zipper-member-having tape adheres to a side opposite to theside adjacent to the opening of the bag.
 11. The zipper-member-havingtape according to claim 2, wherein the convex thread provided on thesurface of the seal layer is substantially quadrangular incross-section.
 12. The zipper-member-having tape according to claim 2,wherein a mounting width of the convex thread provided on the surface ofthe seal layer is 0.5 mm or more and a height of the convex thread is0.08 mm or more, and a summation of a mounting area of the convex threadis 20 to 80% of a surface area of the seal layer.
 13. Thezipper-member-having tape according to claim 2, wherein the convexthread provided on the surface of the non-seal layer is substantiallytriangular shaped in cross-section.
 14. The zipper-member-having tapeaccording to claim 2, wherein a height of the convex thread provided onthe surface of the non-seal layer is 0.03 mm or more.
 15. Thezipper-member-having tape according to claim 2, wherein a combination ofthe resin materials that are substantially non-compatible with eachother is a combination of resin materials whose sealing strength becomes25 N/15 mm wide or less when both the resin materials are laminated inform of a film and heat-sealed to each other.
 16. Thezipper-member-having tape according to claim 15, wherein the combinationof the resin materials that are substantially non-compatible with eachother is a combination selected from a group consisting of a combinationof linear low-density polyethylene using metallocene catalyst(metallocene LLDPE) and polypropylene (PP); a combination ofethylene-vinyl-acetate copolymer (EVA) and polypropylene (PP); and acombination of ethylene-vinyl-acetate copolymer (EVA) and high-densitypolyethylene (HDPE).
 17. The zipper-member-having tape according toclaim 2, wherein the plurality of convex threads provided on the surfaceof the non-seal layer of the male tape and/or the female tape areprovided on a first side demarcated by the zipper member when the firstside is seen from a width cross-section of the male tape and/or thefemale tape, and the non-seal layer of the male tape and the non-seallayer of the female tape on a second side forms a pseudo-adhesionstructure, the second side being demarcated by the zipper member whenthe second side is seen from the width cross-section of the male tapeand the female tape.
 18. A zipper-member-having bag, comprising azipper-member-having tape including a pair of a male tape and a femaletape, the male tape and the female tape having zipper members engageablewith each other, wherein the male tape and the female tape include: aseal layer; and a non-seal layer formed of multiple layers, the non-seallayer being a portion excluding the seal layer and the zipper members, aresin material forming the seal layer is substantially non-compatiblewith a resin material forming the non-seal layer laminated to the seallayer, or at least a pair of resin materials adjacently laminated in thenon-seal layer are substantially non-compatible with each other, aplurality of convex threads are provided on a surface of the seal layerof the male tape and the female tape, a plurality of convex threads areprovided on a surface of the non-seal layer of the male tape and/or thefemale tape, the plurality of convex threads provided on the surface ofthe non-seal layer of the male tape and/or the female tape are providedon a first side demarcated by the zipper member when the first side isseen from a width cross-section of the male tape and/or the female tape,the non-seal layer of the male tape and the non-seal layer of the femaletape on a second side forms a pseudo-adhesion structure, the second sidebeing demarcated by the zipper member when the second side is seen fromthe width cross-section of the male tape and the female tape, and thefirst side of the zipper-member-having tape adheres to a side adjacentto an opening of the bag while the second side of thezipper-member-having tape adheres to a side opposite to the sideadjacent to the opening of the bag.